The singer's baby momma, Nia Guzman, is requesting full custody of their daughter, Royalty. But that's not all she wants! She also recently asked a judge to require Chris to be supervised whenever he wants to visit their baby.

She believes he's not responsible enough to be left alone with the tiny tot, and also feels as though his friends have substance abuse issues. Yikes!

But, the musician isn't going down without a fight!

Sources say the 26-year-old is going to file legal papers to oppose Nia's requests, because he thinks he's actually a really good father!

Insiders explain that in the docs, Chris plans to point out all the things he's done to make his lifestyle safer for Royalty. For example, he's upped security at his home, and has never done anything to put his little girl in danger.

He also claims he has never used illegal substances in the presence of the beautiful babe. But probably the most responsible thing he's ever done is refuse to allow "gang bangers" near his daughter.

The performer hopes to receive joint custody of Royalty, even though Nia wants to shut him out pretty completely.

Zayn previewed the duet by posting a black and white pic of himself with Swifty on his Instagram -- but hey, she is bestiez with his girlfriend Gigi Hadid, so it wouldn't be unusual that they hang out... But collab?!